Blackboard-eraser.



S. SWANSON.

BLACKBOARD ERASER.

APPLICATION FILED MAR. 4. 191s.

Patented Nov. 28, 1916.

wr f) SVEN SWANSON, 0F CHICAGO, ILLINOIS.

IBLACKBOARD-ERASER.

To all whom it may concern Be it known that I, SVEN SwANsoN, a subject of the King of Sweden, residing at Chicago, in the county of Cook and State of lllinois, have invented certain new and useful Improvements in Blackboard-Erasers, of which the following is a specification.

The present invention relates to impro-vements in blackboard erasers and has for its main object the provision of an article that may be easily and cheaply manufactured while possessing the essential features of construction which are adequate to enable the proper functioning of a device of this character.

More specifically myaim has been to provide an eraser which is composed of a plurality of strips of fibrous material so arranged and formed as to eliminate the necessity for the usual wooden hand-grip or block to which the erasing strips are generally applied.

Among the advantages of my construction may be mentioned the fact that the device does not require the use of adhesives for attaching the erasing elements to a body member and the elimination of a wooden body member which in the use of such articles oftentimes causes disturbance where they are dropped upon the Hoor as when used by children in their schoolroom.

For a full understanding of the present invention, reference is to be had to the following description and the accompanying drawing, in which:

Figure l is a perspective view of a device constructed in accordance with my invention. Fig. 2 is a horizontal sectional view taken about on the plane indicated by the line 2 2 of Fig. l. Fig. 3 is a transverse sectional view on the line 3-3 of Fig. 1. Fig. 4L is a perspective view of a slightly modified form of stiffening member employed in this invention.

rlhroughout the following detail description and on the several figures of the drawing, similar parts are referred to by like reference characters.

Referring to the drawing the numeral 1 indicates the intermediate erasing strips and 2 the outer strips, all of said erasing elements consisting of strips of fibrous material, cut substantially rectangular and of suitable thickness to form a substantial body when connected in the manner hereinafter particularly pointed out.

Specification of Letters Patent. Paggnted N0V 239 1916. Application inea Marcil 4, 191e.

Serial No. 82,210.

It will be observed bv reference to the drawing that the outer erasing strips 2 are wider than the intermediate strips to enable the upper portion of each strip to be turned outwardly and then downvmrdly for the purpose of forming an enlarged gripping element indicated on the drawing by the reference character 8.

The strips of material are secured together by a horizontal row of stitching il, the thread or cord of the stitching being passed through all of the layers from opposite sides as most clearly shown in Fig. 2 of said drawing. The row of stitching 4t also passes through the downwardly turned portion of the outer strips 2 and thereby forms a longitudinal depression or groove 5 which cornpletes the grip element at the respective sides of the article.

In the use of the article, the thumb rests in the groove at one side of the eraser while the fingers engage in the groove or depression at the other sido of the eraser aording a substantial handhold for manipulating the device.

I preferably intro-duce into the enlarged grip portions 3 reinforcing members 6, said members consistingof suitable material such as wood or metal and being designed to hold the eraser in proper shape. These reinforcing members may be easily replaced if they become broken in use and arc held in the folded portion of the outer erasing strips by means of the stitching 4L hereinbefore referred to.

In addition to the reinforcing of the eraser above referred to, l preferably provide additional stiffening means therefor consisting of a strip 7 of suitable material, as for instance, leather, cardboard or the like. This stifening member 7 is suitably cut to provide end iianges 8 bent downwardly, said iianges being provided at each end of the strip. and an intermediate flange 9 which is formed by slitting the central portion of the material and bending said cut material downwardly as shown in the drawing. The stitching 4c passes through the downwardly bent flanges thereby holding the stiffening member in place upon the top portion of the eraser, the fianges 8 being disposed between the intermediate strips l and the side strips 2 of the article.

In Fig. t a slightly modified form of stiii'ening means is employed. The strip 7 has its lateral edges 8 bent downwardly to It will `be obvious from the foregoing description that an eraser of this VVtype is of such simple construction that it may be manufactured very cheaply and yet the :eraser will readily'perform the functions desired of an article of this nature.

vHavingthus described my invention, what I claim as new is:

l. An eraser of the class described comrisinO' a 'aluralit of erasinO stri as are Y e,

ranged side by side, the outer strips being turned outwardly and downwardly at their upper portions, and stitching passing through. all of said strips to bind them together and through the downwardly turned .portions so as to form lateral depressions. s

2. VAn eraser of the class described comprising a plurality of erasing strips of fibrous material7 and of substantially rectangular configuration, the outer of said strips being wider than the intermediate strips and having their upper edges turned outwardly and downwardly to form gripping elements, longitudinally extending reinforcing rods disposed in said turned portions, and stitching passing transversely through all of said strips beneath the reinforcing members aforesaid to bindthe strips-together and secure the reinforcing members in place.

3. An eraser of the class described comprising a plurality of erasing strips, stillening means for said eraser consisting of a, sheet of material having lateral fianges disposed between said erasing strips, said stif'lfening means having an intermediate flange also engaged between the strips, and stitching` p assing through the erasing strips and said flanges.

In testimony whereof I aliiX my signature.

SVEN sw'ANsoN.

i(Iovpies of this patentfmay b obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, 1).,0. 

